Overwrite - yes, with or without Read Before Overwrite; check the manual

Delete - don't know, never used it, but probably not

How to handle PI archive event delete request? It depends on your analysis/reporting requirements. Probably the simplest way is to overwrite existing PI data point with some unusual value, say -9999, and use filtering during report generation or AF analysis. Maybe 0 will be sufficient.

Overwrite - yes, with or without Read Before Overwrite; check the manual

Delete - don't know, never used it, but probably not

How to handle PI archive event delete request? It depends on your analysis/reporting requirements. Probably the simplest way is to overwrite existing PI data point with some unusual value, say -9999, and use filtering during report generation or AF analysis. Maybe 0 will be sufficient.

There are several ways to delete data point from the PI Data Archives. If you are just looking to do a one time deletion of some data points, you can use System Management Tools to do that. If you have more complex requirements, you can take a look at AF SDK to do that for you. Thus, it really depends on what kind of deleting you want to do.